[Plugin: WordPress SEO by Yoast] Apostrophe in French articles' titles – Please help

Hi,
I have multilingual site (network) in Eng, Rus, Fre.
Wordpress 3.4.1 theme: Twenty Ten.
English and Rus parts are developing OK. But we have been noticed that our French part is “doesn’t work” in spite of efforts… For example we focused some articles around the keyword “cadets de l’air” (Fr. – air cadets). We were surprised when we found out Google doesn’t associate our articles’ titles (which include “cadets de l’air”) with this keyword!
I think the problems in coding of apostrophe. So with Yoast SEO plugin in title – &#039 in text &#8217
without any SEO plugin – &#8217 in a title as well in text.

When I just copy this key from our title (cadets de l’air) and incert it in Google it says me that it is not correct, LOOK AT THIS PICTURE

I not sure where is more correct… Please help me resolve this problem. I need that Google associate french keywords of my articles correctly.